CDC’s “General Best Practices for Immunization” still states that a patient’s self-report of a history of vaccination without any documentation can generally be accepted as proof of vaccination only for influenza and pneumococcal polysaccharide vaccines. The ACIP recommendation for administering a primary series of inactivated polio vaccine to an adult also indicates that adults may generally be presumed to have had a primary series of polio vaccine unless there is a specific reason to believe that they have not been vaccinated against polio. See the Adult Vaccination section at www.cdc.gov/vaccines/hcp/imz-best-practices/vaccination-programs.html#cdc_report_pub_study_section_5-adult-vaccination.